--- src/pam.c
+++ src/pam.c
@@ -16,8 +16,12 @@
  */
 
 #define PAM_SM_AUTH
+
+#include <stdlib.h>
+#include <string.h>
+
 #include <security/pam_modules.h>
-#include <security/_pam_macros.h>
+#include <security/pam_appl.h>
 
 #include "version.h"
 #include "conf.h"